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Permeability

in²toft²

Convert square inches (permeability) (in²) to square feet (permeability) (ft²).

Factor1 in² = 0.006944444 ft²

Converter

in²

Accepts numbers or expressions, e.g. 150 + 14.7

Result
1ft²

Rendered to 6 significant figures.

Formula

Formula
ft² = in² × 0.006944444

Multiply any value in square inches (permeability) by 0.006944444 to obtain the value in square feet (permeability).

Worked example

Convert 144 in² to ft².

  1. 01Start with 144 in².
  2. 02Multiply by the conversion factor: 144 × 0.006944444 = 1 ft².
Result144 in² = 1 ft²

Conversion table

in²ft²
10.0069444
20.013889
50.034722
100.069444
200.13889
500.34722
1000.69444
2001.3889
5003.4722
10006.9444

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from in² to ft²?
1 in² equals 0.006944444 ft². To convert, multiply the value in square inches (permeability) by 0.006944444.
How do I convert 1 in² to ft²?
1 in² = 0.00694444 ft². For any value, multiply by 0.006944444.
How do I convert ft² back to in²?
Divide by the same factor — or equivalently, multiply by 144. So 1 ft² = 144 in².
When would I need to convert square inch (permeability) to square foot (permeability)?
Permeability conversions between in² and ft² appear in petroleum and reservoir engineering, hydrogeology, geotechnical engineering, packed-bed filtration and porous-materials research. The darcy (D) and its sub-multiples (mD, µD, nD) dominate petroleum-engineering documentation; SI area-equivalent units (m², µm², mm², cm², ft²) appear in geophysics and porous-media research. Intrinsic permeability is a property of the porous medium alone — this category does NOT include hydraulic conductivity (m/s, requires fluid density and viscosity), gas permeability (Klinkenberg slip corrections) or membrane-permeability coefficients, all of which are different physical quantities and require explicit assumptions.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).

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